Coal-polvsbizing machine



vla. JACKSON COAL PULVERIZING MACHINE med April 15, 192s 2 sheets-sheet 2 WENTOR Patente-d Aug. 28, 1928,.

UNITED `vSTATES RALPH JACKSON, OF COVENTRY, ENGLAND, ASSIGNOB TO TED, OF BUTTS,

CG'U'EN'RY, ENGLAND, ABRITISH COMPANY.

cormunvnaizine MACHINE.

Application iiieii Aprii 192s, seriai No. ioiiavand in' Great Britain Mays, 1925. Q I

This invention relates to a pulverzing machine of the type shown in the U. S. patent Yto Blyth Reissue No.`16,229, dated Deo. 15, 1925, and more particularly toal machine constructed as shown my co-pending ap-` plication Serial No. 101,236, Filed April 12, 1926.

For many purposes coal pulverizing` machines with large output but small overall dimensions are required, but with certain constructions it is inadvisable to increase 'the' form a single machine. Y Y

` Fig. 1 is a plan view of a unft constituted by two machines arranged back to back, and a second and similar unit combined with vthe first unit so that they are symmetrical about the line X, Y,and

Fig. 2 is an enlarged plan view of one of the machines, with parts broken away to show the 'internal construction.

In the preferred construction illustrated there is a base plate 2 to each end 3 of which is bolted a pulverizing machine 4L, these being arranged back' to back, "or, in other words, with their driving ends facing one another. This leaves the fan casings '5 easily accessible, which is particularly important where the fan casing, or its cover, is hinged to the body of the machine.

There is employed a common driving shaft 6 which enters both machines and carries the usual rotating elements, and this shaft is driven from a single power source, preferably carried by the base plate. For example, the base plate may have an extension 7 adapted to support an electric motor 10 driving the shaft through right angle gearing 8, generally of a reducing type.

It is preferred that there be a single feed- `attached to the casing.

ing device for both machines, thisv being of Vany suitable nature delivering through` a central aperture 9, though in some cases there may be sepa-rate feeding'devices with independent control and'adjustnient. Coarse material vfed to the opening 9 slides downa chute 11 leading to'each pulveifizing chain# ber. would be solid from end toend, though it may be in sections withintermediate clutches between the central portion Acarrying the gearing and each machine, so that'eith'er machine can be stopped. Y

Each machine may be constructed sired, but as villustrated in Fig. 2, it may comprise a rotor disk' 13 mounted on the shaft 6 within the pulverizing chamber 4L which` carries on eachside concentric rows of revoluble pegs or beaters 14' arranged to co-operate with concentric rows of station- AUsually also the driving shaft 6v as deary pegs 15 suitably `attached to the easing "i walls. A diaphragm ,plate 16 separates the pulverizing chamber from the fan chamber 5. This diaphragm plate has aflarge central aperture 18 through which the pulverized material is drawn by theair current produced by the fan 19 `and subsequently discharged through the `outlet 20, (Fig,A 1 The diaphragm plate and the fan' casing are each hinged to) the pulverizing chamber 4t at the point 21. The bearing 22 for the end ofthe shaft carrying the fanis adapted to be withdrawn endwise from the fan casing, afterv removal of the cap 23 andthe shaft collar 24. The bearing 22 is in the flanged bush or sleeve 25 and is removed byl withdrawal' of the bush from the bracket 26, which latter at its lower parttnot shown) 4'is After the bearing and the flanged sleeve 25 are removed, the sleeve 2S xed on the shaft 6 and provided with a disk 29 extending into the fan easing and at the same time filling the aperture 30` in the latters end wall, can also be removed. This leaves an annular space about the end of the shaft which allows the casing to swing about its hinge 21 without fouling the end of the shaft. When the casing has been swung open the fan wheel19 is exposed, and the latter is so secured to its shaft that it can be quickly detached therefrom.

The diaphragmV plate 16 is also hinged to the pulverizing chamber and the large central aperture 18 permits it to be swung about its hinge without interfering with the end of the fan shaft. This construction permits a ready access to the interior of the pulverizing chamber.

It will be apparent that coarse material delivered by a single feeding mechanism to the aperture 9 will divide, and part will pass down each chute l1 into the pulverizing chamber. The material is then struck by the rapidly revolving pegs la on the inlet side of the rotor disk, and thrownoutwardly while being reduced by impact and attrition between the stationary and revolving pegs. The partially pulverized material passes around the periphery Vof the disk and is drawn inwardly towards theV cent-rally located outlet 18 by the air current produced the fan 19. The material is pulverized to a fine powder by the action of the revolving and stationary pegs on the outlet side of the disk, and only the smallest particles can escape through the outlet, since the tendency of centrifugal force is to throw the material away from the axis of the machine. The fine material which enters the fan chamber is delivered on the air current through the outlet 20 and is transported to any desired point. The two machines forming the unit are driven by the single motor l0, which is so arranged that it will not interfere with the opening of the'. machines for inspection or repair.

`In some instances two units may be combined toform a single machine having a very considerable output. Thus there might be two base plates 2 arranged parallel to one another, each carrying at each end a machine of the kind referred to." The two common driving shafts would then be connected to a single driving means arranged between the two base plates, and, if desired,

Athe two base plates may be combined into one "supporting portion for Vthe single driving means. Thus the base plate may be rectangular or roughly H-shaped. In the latter case, the connecting portion of the H would form the base for the driving means, which might be an electric motor or steam turbine. Y i

Such an arrangement is clearly indicated in the drawing, the second unit being shown to the Vright of the line X, Y, and having corresponding reference numerals. The electro-motor 10 occupies the part of the bed between the two units.

By this means a machine of large output, small overall dimensions, and low cost is provided, whilst high efficiency is maintained.

lVhat I claim as my invention and desire to secure by Letters Patent of the United States is l. A pulverizing apparatus comprising a one piece casing having two spaced centrally located pulverizing chambers, meansrforming a fan chamber outside of each pulverizing chamber, a single shaft passing through the chambers centrally thereof, and driving connections to the central portion of said shaft between the pulverizing chambers.

2. A pulverizing apparatus comprising a one piece cas`ng having two separate pulverizing devices mounted therein in spaced relation, a fan casing outside of each pulverizing device, a single shaft passing through the cas'ng centrally thereof and adapted to drive the pulverizing devices 'and fans simultaneously, means for driving said shaft, means forming a single inlet for coarse material to the central portion of the casing, and means forming an outlet for pullverized material connected to each fan casing.

3. A pulverizing apparatus comprising two spaced pulverizing chambers provided with outlet openings at their outer ends and inlet openings at their inner ends, a common driving shaft passing through the two casings, revoluble pulverizing devices mounted on said shaft in said casings, means forming a fan chamber outside of and connecting w. th the outlet openings, a fan in the chamber mounted on said shaft and arranged to draw a current of air and pulverized material through each pulverizing casing, means forming an inlet for coarse material to said inlet openings, and means connected to said shaft to rotate the same. y

ln testimony whereof I have signed my name to this specification.l

` -RALPH JACKSON. 

